We present the result of multi-wavelength observations of
the microquasar GRS 1915+105 in a plateau state
with a luminosity of erg s-1 (~40%
),
conducted simultaneously with the INTEGRAL and RXTE satellites,
the ESO/NTT, the Ryle Telescope,
the NRAO
VLA and VLBA, in 2003 April 2–3.
For the first time were observed concurrently in GRS 1915+105
all of the following properties:
a strong steady optically thick radio emission
corresponding to a powerful compact jet resolved with the VLBA,
bright near-IR emission, a strong QPO at 2.5 Hz in the X-rays
and a power law
dominated spectrum without any cutoff in the 3–400 keV range.

Based on observations with INTEGRAL, an ESA
project with instruments and science data centre funded by ESA
member states (especially the PI countries: Denmark, France,
Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and
with the participation of Russia and the USA.

**

Based on
observations collected at the European Southern Observatory, Chile
(ESO N°071.D-0073).

***

The National Radio Astronomy Observatory is a facility of
the National Science Foundation operated under cooperative agreement by
Associated Universities, Inc.

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